“pre-image”的概念、定义、翻译、参考文献-科学参考

单词	pre-image
释义	pre-image Mathematics Given a function $f : X \to Y$ and $A\subseteq Y$ , the pre-image $f^{- 1} (A)$ of A is $f^{- 1} (A) = {x \in X \| f (x) \in A} \subseteq X .$ This notation does not imply that f is invertible (see invertible function). Note $f (f^{- 1} (A)) \subseteq A$ , but equality does not generally hold.
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